Improvement in tube-stretching machines



J. T. CONNELLY. TUBE smm'c'mm MACHINE.

INVENTOR,

Patented Aug. 22, 1876.

WITNESSES ATTORNEYS,

. N-FETERS, PHOTO-LITNOGRIAPHER. WASHINGTONv D C STATES PATENT OFFIoEi-JAMES T. OONNELLY, OF GONNELLSVILLE, PENNSYLVANIA.

IMPROVEMENT IN TUBE-STRETCHING MACHINES.

Specification forming part of Letters Patent No. 181,412, dated August22, 1876 application filed July 29, 1876.

To all whom it may concern:

Be it known that I, JAMES T. OONNELLY, of Gonnellsville, in the countyof Fayette and State of Pennsylvania, have invented a new and valuableImprovement in Machines for Stretching Tubes; and I do hereby declarethat the following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to theannexed drawings, making a part of this speclfication, and to theletters and figures of reference marked thereon.

Figure l of the drawings is a representation of a front elevation of mymachine for stretching tubes, and Fig. 2 is a transverse verticalsectional view of the same.

The object of this invention is to provide a cheap and efficient meansfor lengthening metal tubes or pipes without weldingor swaging them; andthe nature of said invention consists in the employment of a strongmetal frame and a longitudinally-adjustable rod provided with a socketand clamp-screws, for

grasping one end of the tube to be stretched,

and applying thereto a longitudinal draft, the other end of said tubebeing held stationary.

This invention is especially applicable to wrought-iron tubes or pipes.

In the annexed drawing, A A indicate two metal end plates, eachof whichhas a central perforation, a, and additional perforations a, a near itsends. B B are rods, the ends of Whichpass through perforations a a, andare provided with nuts or headsb b, which are connected eitherpermanently or detachably to their ends outside of plates AA. 0 O aretwo sleeves or tubes, which set over rods B B and against the innerfaces of plates A A.

The eflect of the combined action of said rods, nuts or heads, andsleeves is to clamp said end plates firmly in place, completing theframe of the device.

D is a metal stretching-rod, which passes through central perforation aof plate A, and is screw-threaded on its outer portion so as to becapable of longitudinal adjustment by means of prismatic nut D andwrench E. The inner end of said stretching-rod terminates in a cup orsocket, F, which is adapted to receive the end of a wrought-iron tube ofany ordinary size, and is provided with clampdiameter much smaller thanthat of said socket. G represents the tube which is to be stretched, andH a collar provided with adjusting and clamping screws H H. Saidtube orpipe passes through central perforation a of end plate A, and saidcollar is then secured on said tube just outside of said plate, so as toprevent said tube from being drawn through said plate by the draft ofstretchingrod D.

In practice, heat is applied to tube G in any convenient manner,(preferably by a fire below,) and nut D is then turned by wrench E untilthe draft on rod D thereby produced has sufficiently stretched tube orpipe G.

This device obviates the need for the old processes of swaging orwelding as applied to metal tubes for the purpose of lengthening them,and thereby avoids several objections incident thereto. For instance,swaging is very apt to destroy the fiber of the iron and greatly weakenor break the tube. is not: applicable to many kinds of metal tubes, andwhere it is applicable it almost always leaves a-raised or lumpy placeat the point of union, and also a weakened portion.

This device is applicable to all kinds of metal tubes, and to rods andbars as well, but is especially designed for stretching boilertubes ofwrought-irom, Such tubes may be stretched several times in this waywithout unduly weakening them, and will last as long as the boiler.

What I claim as new, and desire to secure by Letters Patent, is-

The combination of perforated plate A, collar H, having clamping-screwsH H, perforated plate A, screwthreaded stretchingvrod D, having socket Fand clamping-screws F F, nut D, and suitable framing connect ing saidend plates A A, substantially as set forth. 7

In testimony that I claim the above I have hereunto subscribed my namein presence of two witnesses. JAMES T. GONNELLY. Witnesses:

W. NEWTON PORTER, CHARLES PRINCE.

Welding

